Incandescent gas-lamp.



m 726.765 PATENTED APR. 28, 1903.

- w. SGHAEFER. INGANDESGENT GAS LAMP.

APPLIOATION I'ILED FEB. 15, 1902.

cu. Pnovouma. msmuoiom o. c.

UNITED STATES {PATENT UFFICE.

WILHELM SCHAEFER, OF HAMBURG, GERMANY.

INCANDESCEVNT GAS-LAM 1 4 SPECIFICATION forming part of Letters Patent N 0. 726,7 65, dated April 28, 1903.

Application filed February 15,1902. Serial No; 94,302. (No model.)

To all whom it may cancer-1o- Be it known that I, WILHELM SoH-AEFER, engineer, a subject of the German Emperor, residing at Kleine Backerstrasse 33, Hamburg, in the German Empire, have invented new and useful Improvements in and Relating to Incandescent Gas-Lamps, (f r'Which I have made applications forpaten ts in A us tria,

dated January 13, 1902; in Denmark, dated January 14, 1902; in Norway, dated January 16, 1902; in Sweden, dated January 16, 1902; in Germany, dated January 18, 1902, design patent dated January 18, 1902; in France, dated January 21, 1902; in Belgium, dated January 22, 1902; in Great Britain, dated January 22, 1902, and in Hungary dated January 27, 1902,) of which the following is a specification.

This invention relates to incandescent gaslamps, and has for its object to provide appa ratus for producing increased luminosity without its being necessary to resort to a forced gas-pressure and the accompanying long special feed-pipes for the creation of the increased draft; and it consists in the employment of Bunsen burners for illuminating incandescent mantles with a special form of lamp construction adapted to obtain the great ing power of thewhole lamp-three in this case-the special gas-regulatin g nozzle 5,hereinafter described, beinginterposed. A flange 6, projecting laterally from the tops of the burners, supports the gallery 7, which is shown in plan in'Fig. 2. The incandescent mantle-holder is arranged in the center of the ject hooks 11, from which the incandescent mantles 12 are suspended. These mantles are inclosed by the chimney 13. The chimney is of such a form as to adapt it to the space occupied by the mantles, so that the radiation of heat from the mantles is not in any point atfrcted by the air passing through, and the whole of the heat generated within the chimney is utilized for rendering the mantle more perfectly incandescent, more'especially its top .14, which requires a greater draft, this heat being more thoroughly utilized than when a separate chimney is em- ;ployed for each mantle, as has hitherto usually been the case in lamps of this kind.

The gallery 7 is provided with an outer row of apertures 15, Fig. 2, and also with a central opening 16. The circular openings 17 indicate the points at which the burners proper are attached. Air enters through the openings 15 and passes over the outer side of the mantles, and as the velocity of the air entering at these points leaves no time for it to become distributed in such a manner that it also passes over these parts of the mantles which are in proximity one to the other the central opening 16 is made of such a size that 'suificient air may enter through it for this v pnrpose. .of' the gallery receive the casings of the Bun- Other openings 17 through the floor sen burners, which, it will be observed, are grouped around a central point, represented by the mantle-holder 9 and equidistant therefrom.

Thegas-regulatingrcoclz nozzle 5 consists of an under part 18, which is firmly screwed .upon the gas-conduit. Passages 19 form the outlets, permitting the gas to pass into a chamher which is constituted by a cap 20, screwed upon the part 18. Into the outlet-opening of this cap, which forms the nozzle 21 itself, ex-

the employment of a plurality of burners the eye is only able to distinguish a single source of light, because the burners, with their mantles, instead of being inclosed in separate chimneys, as has hitherto been usual, are inclosed in a single chimney and can consequently be arranged very close together. The mantles therefore act one upon the other by radiation of their heat, so that the heating efii'ect of the Bunsen burner is more completely utilized and the luminosity is proportionately greater than when separate chimneys are employed.

WVhat I claim as my invention, and desire to secure by Letters Patent, is

1. The combination in alamp, of aplurality of Bunsen burners grouped around a central point and each having means for regulating the gas-supply, mantles for the burners, a mantle-holder rising centrally through the group of mantles, a chimney inclosing all of the mantles, a gallery supporting said chimney, an outer series of openings through said gallery to admit air to the outer surfaces of the group of mantles, and a central opening through said gallery to admit air to the contiguous inner surfaces of the group of mantles.

2. The combination in a lamp of a gas-supply pipe, a distributing-chamber, a plurality of Bunsen burners supplied from said chamher, said burners being grou ped around a central point and each having means for regulating the gas-supply, mantles for the burners, mantle-holders for said mantles, a chimney inclosing all of the mantles of such form as to adapt it to the space occupied by the mantles, a gallery supporting said chimney, an outer series of openings through said gallery to admit air to the outer surfaces of the group of mantles and a central opening through said gallery to admit air to the contiguous inner surfaces of the group of mantles.

In testimony whereof I afl'lx my signature in presence of two witnesses.

WILHELM SOHAEFER.

Titnesses:

E. H. L. MUMMENHOFF, T. CHRIST. I-IAFERMANN. 

